import java.io.*;
import java.util.Scanner;

public class Demo13 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入源文件路径");
        String srcPath = scanner.next();
        System.out.println("请输入目标文件路径");
        String destPath = scanner.next();
        File srcFile = new File(srcPath);
        if(!srcFile.isFile()){
            System.out.println("源文件不存在或不是文件");
            return;
        }
        File destFile = new File(destPath);
        if(!destFile.getParentFile().isDirectory()){
            System.out.println("目标文件所在目录不存在");
            return;
        }
        try(InputStream inputStream = new FileInputStream(srcFile);
            OutputStream outputStream = new FileOutputStream(destFile)) {
            while (true){
                byte[] buf = new byte[1024];
                int n = inputStream.read(buf);
                if(n == -1){
                    break;
                }
                outputStream.write(buf,0,n);
            }
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}
